Hey Combat squirrel, i have just downloaded the patch and haven't noticed any improvement's as of yet.
This update improves the compatibility, reliability, and stability of Windows Vista.
This update includes the following improvements:
• It extends the battery life for mobile devices.
• It improves the stability of portable computers and of desktop computers that use an uninterruptable power supply (UPS).
• It improves the reliability of Windows Vista when you open the menu of a startup application.
• It improves the stability of wireless network services.
• It shortens the startup time of Windows Vista by using a better timing structure.
• It shortens the recovery time after Windows Vista experiences a period of inactivity.
• It shortens the recovery time when you try to exit the Photos screen saver.
• It improves the stability of Windows PowerShell.
This update also resolves the following issues in Windows Vista:
• A compatibility issue that affects some third-party antivirus software applications.
• A reliability issue that occurs when a Windows Vista-based computer uses certain network driver configurations.
Known issue:
A known issue was identified in which certain computers that have specific combinations of older AHCI USB chipsets and CD or DVD drives that use the SerialATA interconnection bus may not start after the installation of this package. If you are using a computer that has experienced this issue, you can restart the computer by using a bootable Windows Vista DVD and by selecting the Repair/System Recovery options. If the update is already installed on your computer, and the computer has successfully restarted, you do not have to take any additional action.
Patch for Windows Vista 32-bit based systems
Patch for Windows Vista 64-bit based systems
Source - Microsoft Support 
